[wip] implement standard in (backend)

[akshayka]

This change implements support for reading from standard in on the backend.

This is achieved by adding a new queue to each session/kernel pair, the input_queue. The input() builtin and sys.stdin.readline function are patched to send a control message to the frontend, requesting input. They then pull an input from the input queue, blocking until an input is available.

A new route is added, /api/kernel/stdin, that just accepts text and puts it in the input queue.

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[codecov[bot]]

Codecov Report

Attention: 46 lines in your changes are missing coverage. Please review.

Comparison is base (cb6fbd8) 64.25% compared to head (3384f8d) 64.27%. Report is 3 commits behind head on main.

Files	Patch %	Lines
marimo/_messaging/streams.py	64.81%	19 Missing :warning:
marimo/_server/sessions.py	0.00%	11 Missing :warning:
marimo/_runtime/runtime.py	42.85%	4 Missing :warning:
marimo/_server/api/stdin.py	78.57%	3 Missing :warning:
marimo/_runtime/context.py	50.00%	1 Missing :warning:
marimo/_server/api/code_complete.py	0.00%	1 Missing :warning:
marimo/_server/api/delete.py	0.00%	1 Missing :warning:
marimo/_server/api/function_call.py	0.00%	1 Missing :warning:
marimo/_server/api/instantiate.py	0.00%	1 Missing :warning:
marimo/_server/api/run.py	0.00%	1 Missing :warning:
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #587      +/-   ##
==========================================
+ Coverage   64.25%   64.27%   +0.01%     
==========================================
  Files         130      132       +2     
  Lines        6370     6440      +70     
  Branches     1285     1293       +8     
==========================================
+ Hits         4093     4139      +46     
- Misses       2096     2121      +25     
+ Partials      181      180       -1     

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